One of Sarah's daughters died. But can she be sure which one? *THE SUNDAY TIMES NUMBER ONE BESTSELLING NOVEL* A terrifying psychological thriller perfect for fans of THE GIRL ON THE TRAIN. A year after one of their identical twin daughters, Lydia, dies in an accident, Angus and Sarah Moorcraft move to the tiny Scottish island Angus inherited from his grandmother, hoping to put together the pieces of their shattered lives. But when their surviving daughter, Kirstie, claims they have mistaken her...